accellerating

When I drive on half throttle the car accelerates smoothly, but when I give it some boot it will jerk while accelerating. I can clearly hear the diverter valve blow off when this dip in power is, its almost as if I let go of the gas for a second. It is most noticable in 3rd- 6th gear. I have...

Hi, I have a 166 JTDm FL and it hesitates a bit when accelerating on high gears (5th and 6th). The rev. meter sort of oscillates a bit when it is in between 2 and 3 thousand revs. Then it continues steadily towards the red line. I have not noticed this phenomenon when I accelerate on low gears...

Driving my 2000 GTV Spider (six years old 72,000 mikes) I experienced the total inability to accellerate! Overtaking on mild incline on motorway, dropped down from 5th to 4th, foot down.....revs would not go above 4000 and car would not increase in speed. This happens consistently when I...